Sewage distributing pipe



Nov. 24, 1931. v D. CRAIG 1,832,967

SEWAGE DISTRIBUTING PIPE Filed April 7, 1928 A25 j "gf 19 atys.

Patented Nov. 24, 1931 UNITED sTA'ri-:sl

A Pzi'rlaztrr vfori-'lea Y DAVID CRAIG, oF PEABODY, MASSACHUSETTS SEWAGE DISTRIBUKTING PIPE Application led April 7, 1928. Serial No. 268,128.

This invention pertains to sewage disposal systems and relates more particularly to improvements in the construction and arrangement of the distributing pipes which areY s ridapted 'to carry the effluent from a septic tank or cesspool and to discharge the waste into the soil.

In the subterranean disposal of sewage waste it is highly desirable, if not quite necessary, that the tank efliuent be delivered to the soil at points near the surface of the earth; for it is well known that the presence of the bacterial agents which act upon the sewageu is confinedwithin a layer extending only` about two feet below the earths surface.' It

is also desirable that the deposit be dispersed over a wide area, in order that relatively4 small quantities of the entire sewage waste may readily be absorbed at a multitude ofl a separate points. Accordingly, it is al principal object of the present invention to pro` vide an underground distributing pipe having a plurality of spaced discharge apertures,` whereby the eliiuent may drain directly fromv y 25 *he pipe into the soil at manv separated points throughout the length of the pipe. Another object of the invention is to provide means,

within the pipe for retarding the How of the elliuent, in order to ensure substantially uniform distribution of the waste and to pre.-v

vent a large quantity of the sewage from flowing through the pipe system and depositing at the open ends of the pipes. Y

Recommended embodiments of the inven- 35 tion are Shown for the purpose of illustration` in the accompanying drawings, in which,

Fig. 1 is a plan view of a septic tankv equipped with the improved distributingI Plpes; v v Fig. 2 is a side elevationV thereof, looking toward the left of Fig. 1;

Fig. 3 is an enlarged detail. partly in section, of the improved pipe structure, illustrating one means of retarding the How of Fig. 4 is an enlarged side elevation of an op; tional form of sectional pipe; and

Fig. 5 is a transverse Section taken on the line 5 5 of Fig. 4.

` The improved pipe system preferably leadsl vlength ofthe pipes Vand the number of its Vbends and branches will, of course, depend `the digging of a 4plurality of terminal vvcess- "pools.

from `a septic tank 6, or `other reservoir dr trap, which may be buried in the ground with its ,top at or slightly below the surface, `and which has an inlet pipe 7 `adapted to convey sewage from the house, and an outlet pipe v4S. The tank 6 may be off anyvdesired construc-V tion and may have a clean-out manhole 9 in its top; the inlet pipe preferably enters the V,tank at the same level as, or slightly above, the outlet pipe, and 'the latter may extend downwardly within the tank, as indicated by the broken lines of Fig. 2, in order that the effluent of the tank, free from the accumulated surface scum, may readily flow Vfrom the outlet A p i Y The main distributing pipe connects with the outletpipe 8 land may have branches 10 and 11 extending undergroundand terminating in open ends 12 and 13 respectively'. The

3p) in the pipe wall,which permit the eiiuent to drain into the soil atrregularly spaced intervals along substantially the entire length of the pipe. The openings are preferably in thebottom of the pipeand closely spaced;y

- but they may bey disposed in the side walls of the Vpipe and may be spaced at a relatively greater distance,if desired. Suchlaconstruction ensures rapid drainage, absorptionand decomposition of the eiuent in the bacterial,

regionfof the ground adjacent the surface,

and'obviates the necessity of a large number of solid-walled bran ch-distributing pipes and The distributing pipe'smay be laid in relatively shallow 4trenches substantially parallel to the surface of the ground,or may be inclinedvfrointhe horizontal. In order to -retard the :flow of effluent and ensure properVv drainage through the apertures 14, the pipe sections are preferably so constructed as to provide barriers to the onward flow. This purpose may be satised by inclining certain of the pipe sections and upwardly offsetting the succeeding section by means of a connecting elbow. 'I` he upwardly bowed elbows may be at the bends 15, 16 and 17 of Fig. 2, or they may be introduced in a straight section of pipe, as at 18, Fig. 3. In either event, the partial obstruction to the passage of elluent causes a quantity of the waste matter to collect in the pipe sections ahead of the raised elbows, as indicated in Fig. 3. Such a fea-- ture has especial value when the ground surface slopes downwardly from the septic tank, for in such case most of the eiiiuent would tend to flow past the apertures and out the ends of the inclined pipes, if no obstruction to the How were provided.

A distributing pipe made of concrete sections is particularly suitable for the purposes of this invention, and such a structure, as illustrated in Figs. f1 and 5, may comprise bottom sections 19, having openings 20, and top sections 21. The upper sections may be properly centered upon the lower members bv a tongue and groove union, as shown at 22 (Fig. 5). In addition to the apertures 20, other drainage openings 23 may be provided between the abutting ends of the bottom sections by cutting away a portion of the end faces thereof.

A distributing pipe constructed in anv of the forms above described admirably fulfills the objects of this invention and provides a Simple and economical means for the rapid and effective disposal of sewage. It will be understood, however, that particular details of structure may be varied to suit particular purposes without departing from the essence of the invention as defined in the following claim.

I claim:

In a sewage disposal system, an underground drainage pipe for distributing eiiluent from a tank, the pipe comprising a series of longitudinal sections and each section having a. plurality of openings through its bottom, the openings being spaced at frequent longitudinal intervals intermedia-te the ends of the respective sections to allow a large portion of the effluent to drain into the soil from the sections near the tank as the elluent flows through the pipe, the sections being inclined downwardly from the horizontal in the direction of flow, and vertically inclined elbows connecting the lower end of certain sections with. the higher end of the respective suc- Ceedmg sections so that such succeeding sections are vertically offset from the plane of the preceding sections, substantially parallei thereto, whereby the tlow of eliiuent is retarded to allow the absorption of the ettluent into the soil beneath such preceding sectlons, and whereby the pipe may be dlsposed near the surface of the ground.

Signed by me at Boston, Massachusetts, this sixth day of April, 1928.

DAVID CRAIG. 

